face recognition vs automatic face recognition

face recognition and automatic face recognition both are nouns.

Word	Noun	Adjective	Verb	Adverb
face recognition	Yes	No	No	No
automatic face recognition	Yes	No	No	No

As nouns, face recognition and automatic face recognition are synonyms defined as:

face recognition and automatic face recognition: biometric identification by scanning a person's face and matching it against a library of known faces

Other synonyms of face recognition include facial recognition.

face recognition (noun)	automatic face recognition (noun)
the visual perception of familiar faces	biometric identification by scanning a person's face and matching it against a library of known faces
biometric identification by scanning a person's face and matching it against a library of known faces